Bob Lazar shatters the cloak of secrecy surrounding the Unites States military's most highly sensitive operations located at an area known as S4 of Area 51, in the Nevada Air Force Range. Lazar gives a full account of Alien spacecraft the Government has hidden at S4 as well as details on their propulsion systems and how they operate. Bob Lazar was part of the reverse-engineering team. As chief physicist on project "Galileo", Lazar reveals what the US Military has known and held secret for decades. The Lazar Tape - describes and portrays the components and capabilities of an extraterrestrial vehicle used for interstellar space travel; a gravity propelled disc.

Between December 1988 and April of 1989, as a young nuclear physicist, Bob Lazar was part of the back engineering team. As part of this team his job was to understand and attempt to duplicate the propulsion systems of these craft.